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Put JTable onto your form and open Table model property editor. Look at the combobox in the "Type of column" column. It should contain Object type (Object is the default type but it is not in this combobox). When user click at this field by accident he don`t have a chance to change this type back to the "Object".
Priority is changed to P4 (normal).
Fixed in the open source trunk.
Verified in Build 2012.
Resolved for 3.3.x or earlier, no new info since then -> closing.